As he did so memorably for baseball in Moneyball, Lewis takes a statistical X-ray of the hidden substructure of football, outlining the invisible doings of unsung players that determine the outcome more than the showy exploits of point scorers. In his sketch of the gridiron arms race, first came the modern, meticulously choreographed passing offense, then the ferocious defensive pass rusher whose bone-crunching quarterback sacks demolished the best-laid passing game, and finally the rise of the left tackle—the offensive lineman tasked with protecting the quarterback from the pass rusher—whose presence is felt only through the game-deciding absence of said sacks.- From Amazon